Isolated Phase Reference | New Bently Nevada 126648-02
Manufacturer: Bently Nevada
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Part Number: 126648-02
Condition：New with Original Package
Product Type: Keyphasor Modules
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Overview
The Bently Nevada 126648-02 serves as the isolated I/O interface for the 3500/25 Keyphasor® module within the 3500 Machinery Protection System. This specialized card processes once-per-turn pulses from proximity probes or magnetic pickups to provide accurate speed and phase reference data. We supply this module as 100% Brand New and Original, featuring advanced galvanic isolation to eliminate ground loops and signal interference in complex industrial earthing environments.
Technical Specifications
| Feature | Details |
| Module Type | Isolated Keyphasor® I/O (Internal Termination) |
| System Compatibility | Bently Nevada 3500/25 Monitoring Series |
| Input Support | Magnetic Pickups / Proximity Probes |
| Isolation | Fully isolated to prevent ground loop interference |
| Dimensions | 241.3 × 24.4 × 103.1 mm (9.50 × 0.96 × 4.06 in) |
| Net Weight | 0.46 kg (1.01 lbs) |
| Shipping Weight | 1.4 kg (3.0 lbs) |
| Certifications | CE Certified |
| Origin | USA |
Engineering Advantages
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Galvanic Signal Isolation: The 126648-02 incorporates isolation circuitry that physically separates the field sensor signals from the 3500 rack's internal backplane. This prevents common-mode noise and ground potential differences from corrupting critical timing pulses, ensuring rock-solid phase measurements even in electrically "dirty" environments.
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Multi-Probe Compatibility: This I/O module accepts signals from both passive magnetic pickups and active 3-wire proximity transducers. This flexibility allows engineers to standardize on a single I/O type for various speed sensing applications across the plant.
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Elimination of False Triggering: By cleaning and isolating the Keyphasor pulse, the 126648-02 prevents the 3500 system from registering "ghost" pulses or double-triggering. This stability is vital for accurate vibration phase analysis and precision balancing of high-speed rotors.
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Simplified Rack Installation: The module slides directly into the rear of the 3500 rack. Its compact width (0.96 inches) ensures maximum channel density, allowing for multiple Keyphasor inputs within a single protection system without occupying excessive rack space.
FAQs
1. What is the difference between the 126648-01 and the 126648-02?
The 126648-02 specifically denotes the isolated version of the Keyphasor I/O. While the non-isolated version works in simple setups, the -02 version is mandatory for sites experiencing ground loop interference or where sensors and the 3500 rack utilize different grounding points.
2. Can I use this I/O module with a 3500/50 Tachometer module?
No. The 126648-02 is designed exclusively for the 3500/25 Keyphasor module. Tachometer modules (3500/50M) require their own dedicated I/O cards to process high-frequency pulse trains for continuous speed monitoring.
3. Does this module support internal or external termination?
The 126648-02 is an Internal Termination (IT) module. Field wiring connects directly to the screw terminals on the back of the I/O card itself. If your site uses External Termination Blocks (ETBs), you require the "External Termination" variant of this I/O.
4. How do I configure the input for a magnetic pickup vs. a proximity probe?
You set the sensor type within the 3500 Rack Configuration Software. The software adjusts the threshold and hysteresis levels of the 126648-02 circuitry to match the specific voltage output characteristics of your chosen transducer.